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 _______________/  the CTX files    \
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| Free infinite plane                |
| depth 16                           |
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| corTeX / Optimum  11 aug. 1998     |
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|____________________________________|


Display a (2) free-directionnal infinite textured plane.

This is exactly the same method that was used in the free-directionnal
tunnel; only the formula in the precalculation routine is changed.

In fact I worked a bit more than that :) and optimised the routines:
precalc array are directly in ints, and no more in floats; and it is
in 8:8 fixed point instead of 16:16;
 Such big precision was useless to interpolate for 8 pixels; and reducing
 to 8:8 avoid one shifting when computing the texture address (the integer
 part of Y is already on the good place) (when texture is 256x256)

Some notes :
	it would be cooler if the texture was shaded (darker when far);
	this could be done by switching to a palette-based txeture,
	having some ( like 16) pre-darkened palettes, and choosing
	the good one for each interpolating square.
	... I leave this as an exercise for you :) ...

	You will notice the ripples at some orientations of the plane;
	they are typical of this technique.
	Perhaps it would be interesting to use other interpolation
	method, on larger ranges, but with Quad-interpolation
	(you dont know what it is ? => it will be a good exercise to
	find and to implement it :)  )

The texture is once again ripped from the gimp patterns...
(www.gimp.org)


corTeX / Optimum, time to sleep...